Research Of Non-smooth Surface Flow Drag Reduction Characteristics Application On Centrifugal Pump

With the accelerate development of water treatment, petrochemical, electric power, oil and gas, agriculture and the construction of key projects, pump products demand will continue to expand, it is expected to remain highly demand in the coming years. Where there is fluid flow there has a place of pump, pump play an important role in the national economy. Almost all power of pump station was used to overcome the frictional resistance of wall in the process of oil and natural gas long-distance transmission. Drag reduction means energy saving, it not only has very high application value and has a wide range of economic value to reduce the wall friction loss and improve energy utilization.This paper was funded by Zhejiang province natural science project: The bionic non-smooth jet surface coupling drag reduction characteristics and boundary layer control research(LQ15E050005), the main works and results are as follow:1. Semi-circular pits non-smooth surfaces and space V non-smooth surface drag reduction calculation model was established in accordance with the dung beetle, shark special surface structure. It was extracted, abstracted and simplified according to the structure and working principle of centrifugal pump;2. Different unit of non-smooth shape and configuration scheme ware selected to analyze the non-smooth surface drag reduction characteristic of centrifugal pump impeller using the method of numerical simulation and experimental validation;3. The effect of non-smooth surface position, shape and distribution on centrifugal pump performance, the velocity distribution and wall shear stress of blade ware researched, the related factors of non-smooth surface on the properties of drag reduction effect was explored;4. As for the centrifugal pump solid-liquid two phase fluid flow rule, pit type non-smooth surface of blade was established based on non-smooth surface drag reduction technology;5. Non-smooth surface of blade drag reduction characteristics of solid-liquid two phase flow was studied by selecting Euleriar multiphase flow model for numerical calculation. The distribution of solid phase particles and the influence of non-smooth surface on blade wall shear stress ware researched in different volume concentration Cv.